Evan Grant of the Dallas Morning News reports that Brandon Webb was scratched from his scheduled minor league rehab start this evening due to shoulder discomfort.

Webb, who hasn’t pitched in the big leagues since Opening Day of the 2009 season, was scheduled to make his first start with Triple-A Round Rock. He was being moved up for Friday’s outing, despite posting an ugly 9.75 ERA and 8/6 K/BB ratio over four starts with Double-A Frisco. He allowed four runs over five innings in his last start last Friday.

The Rangers signed Webb to a one-year contract with $3 million in guaranteed salary, but it’s increasingly likely that he won’t throw a pitch for the big-league club.